Motel le Havre, formerly known as Motel-Bar Turco, in Ste-Marthe-du-Cap burned to the ground.
The motel was targeted by police from the Mauricie and Centre-du-Québec regions last March for possible drug involvement.
Bricks and other debris littered the street outside the two-storey motel at 21 Courteau St., which also housed a bar.
A man working at a garage across the street described the sound of the explosion as "phenomenal."
The six victims were treated on site by paramedics.
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